Chair support structure



FIG. 1 is a front perspective view of a chair support structure embodying the present invention;

FIG. 2 is a front view of the chair support structure of FIG. 1;

FIG. 3 is a rear view of the chair support structure of FIG. 1;

FIG. 4 is a right side view of the chair support structure of FIG. 1;

FIG. 5 is a left side view of the chair support structure of FIG. 1;

FIG. 6 is a top view of the chair support structure of FIG. 1; and,

FIG. 7 is a bottom view of the chair support structure of FIG. 1.

The broken lines shown herein are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a chair support structure, as shown and described. 